State whether the following statement is true or false:
Calcium oxide is also called lime or quicklime.

Give reasons for the following:
$(i)$ Moist air and acidic gases are not good for some metals.
$(ii)$ Chips manufacturers usually flush bags of chips with nitrogen gas.

Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is

Give the characteristic tests for the following gases:
$(a)$ $O_2$
$(b)$ $H_2$

You are provided with two containers made of copper and aluminium. You are also provided with solutions of dilute $HCl$,dilute $HNO_{3}$,$ZnCl_{2}$,and $H_{2}O$. In which of the above containers can these solutions be kept?

Which of the following statements about the given reaction are correct?
$3 Fe (s) + 4 H_2 O (g) \longrightarrow Fe_3 O_4 (s) + 4 H_2 (g)$
$(i)$ Iron metal is getting oxidised
$(ii)$ Water is getting reduced
$(iii)$ Water is acting as reducing agent
$(iv)$ Water is acting as oxidising agent